KR200302579Y1 - A arrester having radial insulators - Google Patents

Abstract

The present invention uses a dielectric having a groove-shaped radial structure as an insulating material, and reduces the transmission loss by using an air layer filled in the groove as an insulating layer, and at the same time, widens the cross-sectional area of the center conductor to increase the line constant resistance. The present invention relates to a lightning arrester equipped with a dielectric of a radiation structure capable of reducing the

The present invention, the housing is formed with a fixing hole penetrated in an inverted T shape; An input and an output connector provided at both sides of the housing to connect with a communication line; A center conductor connected to the input and output connectors and receiving power from a transmitter to an antenna and applying the same to a receiver; And a grounding means mounted to the center conductor in a vertical direction and grounding means for grounding lightning introduced from a communication line, the arrester being installed at both sides of the center conductor and having an air filling groove having a predetermined depth in a radial direction. It provides an arrester having a dielectric of a radial structure comprising a.

Description

A arrester having radial insulators

The present invention relates to an arrester for protecting a transmitter and a receiver of a mobile communication base station from a lightning strike, and more particularly to an arrester equipped with a dielectric of a radiation structure capable of reducing the line constant resistance by the dielectric as a radiation structure.

In general, when surge energy such as overvoltage enters a transmission, a receiver, etc. of a mobile communication base station, the possibility of damage to a circuit is increased. In particular, there is a high possibility that the antenna may cause overall damage to the system due to the inflow of high voltage such as lightning. Lightning is a maximum voltage of 10KA, lasting for more than 2ms and electrical charges of more than 50As.

In order to prevent damage to the mobile communication system from the inflow of surge energy, an arrester (Arrester) is usually installed on a transmission / reception line. Currently, the arrester has reached a certain level to protect the mobile communication system, but recently, a problem of the passive intrmodulation distortion (PIMD) caused by the arrester has recently emerged.

There are two types of arresters, a quarter wave stub arrester and a gas idscharge tube surge arrester. Both of these arresters allow information signals to pass through and lightning components to the ground. It has a characteristic to make.

A stub type arrester currently used in a mobile communication base station includes: a housing 1 having a fixing hole penetrated in an inverted T shape as shown in FIG. 1; A center conductor (2) positioned at the center of the horizontal fixing hole of the housing (1) and receiving power from a transmitter to an antenna to be applied to a receiver; An insulator (3) fitted to both outer peripheral portions of the center conductor (2); A pin 4 inserted into one end of the center conductor 2; A socket 7 inserted into the other end of the center conductor 2; Female and male shells (6, 8) screwed to both outer surfaces of the housing (1) to connect with external communication lines; A stub (9) having a quarter wavelength coupled to vertically branch from the center of the center conductor (2), for grounding lightning strokes introduced from the communication line; A body 10 coupled to the upper fixing hole of the housing and having a stub 9 positioned therein to match impedance with the stub 9; A shorting cover 11 coupled to an upper outer circumferential surface of the body 4; It consists of a body 10 coupled to the upper portion of the housing 1 and a terminal 13 coupled to the upper end of the stub 9.

Reference numeral 12 is a bolt and 14 is an O-ring.

Briefly explaining the operation state of protecting expensive communication equipment by using a stub type arrester having the above configuration, when a lightning strike, most of the lightning is extinguished into the ground by a steel tower or a building, the rest of the antenna and It enters the equipment inside the mobile communication base station through the connected communication cable. At this time, the lightning strike introduced into the arrester is to protect the equipment of the expensive mobile communication base station by flowing to the ground through the terminal.

The stub type arrester is a device using a short stub having a length of 1 / 4λ of a wavelength, and inserts a tuned stub 9 in the center of a signal line through which an RF signal passes so that only signals of a specific frequency band pass through the signal line. It can be used in a narrow frequency band, and has the characteristic of passing energy in the band related to the center frequency. On the other hand, the gas discharge tube type arrester is a device using a tube sealed with an inert gas, which can be used in a relatively wide frequency band and has a characteristic of transmitting DC voltage.

Here, the stub type arrester is mounted as a short circuit at the end of the device to be protected, and when a surge signal is received from the outside, the stub type arrester exits to the grounded place through the stub in the center of the arrester. In the stub type lightning arrester that is subjected to the above series of processes, as shown in FIGS. 2 and 3, the insulator 21 has a cylindrical shape, and thus the dielectric constant becomes high, and thus, the transmission loss becomes worse. In addition, the cross-sectional area of the center conductor 22 decreases, so that the line constant resistance, which is a resistance of the thickness of the line, increases, resulting in poor PIMD, resulting in a decrease in transmission efficiency, thereby reducing the characteristics of the entire arrester.

Therefore, the present invention was devised to solve the above problems, but using a dielectric having a groove-shaped structure as a insulating material, but reducing the transmission loss by using an air layer filled in the groove as an insulating layer. At the same time, an object of the present invention is to provide a lightning arrester having a dielectric having a radial structure that can reduce the line constant resistance by increasing the cross-sectional area of the center conductor.

1 is a cross-sectional view showing the configuration of a general arrester.

Figure 2 is a half sectional perspective view showing the configuration of the arrester according to the prior art.

Figure 3 is a perspective view showing the configuration of the insulator according to the prior art.

Figure 4 is a half sectional perspective view showing an embodiment configuration of a lightning arrester equipped with a dielectric of a radiation structure according to the present invention.

5 is a perspective view showing the configuration of an insulator which is a main part of the present invention;

* Explanation of symbols for main parts of the drawings

101: dielectric 102: air filling layer

103: center conductor

The present invention for achieving the above object is a housing formed with a fixed hole penetrated in an inverted T shape; An input and an output connector provided at both sides of the housing to connect with a communication line; A center conductor connected to the input and output connectors and receiving power from a transmitter to an antenna and applying the same to a receiver; And a grounding means mounted to the center conductor in a vertical direction and grounding means for grounding lightning introduced from a communication line, the arrester being installed at both sides of the center conductor and having an air filling groove having a predetermined depth in a radial direction. It provides an arrester having a dielectric of a radial structure comprising a.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The lightning arrester with the dielectric having the radiation structure according to the present invention is implemented to improve the characteristics of the entire arrester and to reduce the PIMD by using the dielectric having the air layer, as shown in FIG. Likewise, the structure in which the dielectric 101 having the air filling groove 102 having a predetermined depth in the radial direction is mounted on both ends of the center conductor 103 is proposed.

By using the dielectric 101 containing a lot of air layers as described above, it is possible to increase the diameter of the center conductor 103 to reduce the line constant resistance, which is the resistance made by the thickness of the line. As a result, the return loss and insertion loss can be reduced and the allowable power of the line can be increased, and the passive intrmodulation distortion (PIMD) can be reduced as the current density decreases by increasing the contact cross-sectional area through which the current passes. Will be.

When the dielectric in this embodiment is used, the reason for the increase in the diameter of the center conductor can be explained by the impedance formula of the following transmission line.

Equation 1

That is, in general, the impedance Zo is used to 50 ohms (ohms), wherein when the dielectric constant increases, the outer conductor inner diameter (D) must increase or the outer diameter (d) of the inner conductor should be reduced. Applied to this formula, the dielectric constant of the radial dielectric material contains an air insulation layer, which lowers the dielectric constant. Therefore, the inner diameter of the outer conductor can be reduced and the outer diameter of the inner conductor can be increased.

In the PIMD, IM (Intrmodulation) means that a signal that is not present in the input signal is intermodulated when two or more frequencies pass through a nonlinear system or a circuit, and an IMD (Intrmodulation Distortion) is used for such intermodulation components. Means distortion itself.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

As described above, according to the present invention, by using an insulator installed at both ends of the center conductor of the lightning arrester as a dielectric having a radial groove, reflection loss and insertion loss can be reduced, the allowable power of the line can be increased, and a current passes through Increasing the contact cross-sectional area of the center conductor has an effect that can reduce the current density, that is, reduce the PIMD.

Claims (1)

A housing having a fixing hole penetrated in an inverted T shape; An input and an output connector provided at both sides of the housing to connect with a communication line; A center conductor connected to the input and output connectors and receiving power from a transmitter to an antenna and applying the same to a receiver; And a grounding means mounted to the center conductor in a vertical direction and including grounding means for grounding lightning introduced from a communication line. Lightning arrester is provided on both sides of the center conductor, the dielectric having a radial structure including a dielectric having an air filling groove of a predetermined depth in the radial direction.